Sometime along the line, the Acolyte Mouse started dropping Mysterious Boxes. Sometime later, these could be opened.

The Acolyte also drops the Frozen Scroll - an important ingredient to building the Ice Maiden Trap.

Years ago, it was the Acolyte mice that brought necromancy to the face
of the Kingdom. Their undead creations rose from the depths of the
Catacombs for the sole purpose of destroying Gnawnia.

Hunter's lore states that the first ever MouseHunter devised a
way to turn the spells of the Forgotten Book against the Acolytes and
banish them to another realm of existence, somewhere between the dead
and the living. Had it not been for the heroic efforts of this
MouseHunter named Plankrun, the small village of Gnawnia may never have
become the prosperous town it is today.

With their long-feared return, the Acolyte mice have amassed
their creations, preparing and organizing for the only reason they
exist: to eradicate each and every MouseHunter!

Arcane traps are ineffective against Arcane mice.Dragon mice, however, have a weakness against the Ice Maiden. a draconic trap.The only known weakness of the acolyte mouse is the Ancient Box Trap, which is a Forgotten Trap. But thats not very effective, its still of normal effectiveness.